METALLIC 75
more attention than any other person, lias deduced nearly the same results. (Annals of Philos. 2—172). He finds 83| sulphuric acid 4-31 oxide^ and 34,2 carbonic acid+e55.8 oxide; that is9 when reduced to coin pare with ray results, 34 sulphuric acid+ 31.3 oxide, 19A carbonic acid + 32 oxide. This near agreement may be considered as a confirmation of the accuracy of both. Dr. John finds, as I have done, three distinct oxides of manganese, the greyish green, the broxvn, and the black. The first of these is the only one that combines with acids; but we differ materially as to the quantity of oxygen in each. He found manganese decompose water at the ordinary temperature; by oxidizing the metal this way? 100 metal acquired 15 oxygen to constitute the protoxide; according* fco this, 28 metal+4 oxygen would make 32 prot-u&'ide; but this conclusion would, be so con* trary to all analogy,, that it cannot be admitted, as satisfactory. The probability is, that the manganese must have contained a little oxygen at the commencement of the experiment. The general analogy of manganese to iron,, lead, &c. requires that 32 protoxide should contain 7 oxygen. If this be allowed, we have the atom of mangauese =•= 25, and not 40, (as at page 266, VOL. 1), the same as